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    <title>第四课 策略模式</title>
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    <script>
        var levelObj = {
            'A+':function(money){
                return money * 3;
            },
            'A':function(money){
                return money * 2;
            },
            'B':function(money){
                return money * 1.5;
            },
            'C':function(money){
                return money * 1;
            },
            'D':function(money){
                return money * 0.8;
            }                                                
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        console.log(calcWrapFn('B',10000));
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